package StudyCode.summary.mycollection;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

/**
 * 版权所有 科技与人文(www.tah1986.com)
 */
public class GetSetViewOfKeysFromHashMap {
	public static void main(String[] args) {
		HashMap hMap = new HashMap();
		hMap.put("1", "One");
		hMap.put("2", "Two");
		hMap.put("3", "Three");

		Set st = hMap.keySet();

		System.out.println("从HashMap Key创建的集合包含 :");

		Iterator itr = st.iterator();
		while (itr.hasNext())
			System.out.println(itr.next());

		st.remove("2");

		boolean blnExists = hMap.containsKey("2");
		System.out.println("HashMap 是否包含 2 ? " + blnExists);
	}


}
